Coil-guard for armatures



(No Model.) 2 Sheets-Sheet 2.

W. S. BELDING.

COIL GUARD POR ARMATURES.

No. 415,696. Patented Now/126, 1889.

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` UNITED STATES PATENT OFFICE.

WARREN S. BELDING, OF ENGLEIVOOD, ASSIGNOR TO THE BELDING MOTOR AND MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS.

COIL-GUARD FOR ARMATU RES.

SPECIFICATION forming part of Letters Patent No. 415,696, dated November 26, 1889.

`i Application filed July '7, 1888. Serial No. 279,314. (No model.)

To all whom t ivi/ay concern:

Be it known that LWVARREN S. BELDING, a citizen of the United States, residing at Englewood, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Coil-Guards for Armatures 5 and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled 1o in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

I5 This invention relates to improvements in armatures to facilitate the forming of the wire coils upon the core of the armature and to prevent the displacement of the coils after they have been formed. I accomplish my obzo ject by combining with the core any desired number of coilguards, as will be hereinafter described, and specified in the appended claims.

In the accompanying` drawings, Figure 1 is a blank from which is to be formed one of the coil-guards. Fig. 2 is a view of one of the coil-guards formed from such a blank as is shown in Fig. l. Fig. 3 is an end View of a portion of an armature-core having upon it three coil-guards, one of, which contains a coil. Fig. 4 is a side view of the section of core shown in Fig. 3. Fig. 5 is a transverse section through a portion of a core and coil. Fig. 6 is an end view of a Gramme ring provided with my coil-guards. Fig. 7 is a section taken through said ring. Fig. S is a view of a modified form of the guards.

It has been found in the manufacture of armatures that it is difficult to form the coil around the end of the bobbin-space. The wires, instead of lying one upon the other in regular order, as is required to form a perfect coil, slip and spreadso that it has been nearly impossible to make coils which were correct in form and which would remain so 1n use. To avoid this difiiculty, armature-cores of the Pacinotti type have been cast with lateral as well as radial polar extensions. Thus a channel would be formed around the end of the bobbin-space,wl1ich channel could 5o be wound full of wire; but these lateral polar extensions add to the weightof the armature, which is in some cases objectionable. Furthermore, many armature-cores are now made by combining a number of annular metal plates arranged side by side in planes at right angles to the axis of the armature. In the use of such plates each may be out with radial polar extensions, so that when the plates are combined the complete cylinder will have 6o radial polar extensions. Then,when the wire is wound, it does not build up correctly in turning at the end of the bobbin-space. My coil-guards are to be applied at such ends to retain the wire and cause it to build up there, as it does between the radial polar extensions.

When the Gramme ring is used, it is difficult to build up the wire into coils extending over the same space and containing equal 7o quantities of wire. However much care may be exercised in spacing, it is frequently found that the last bobbin-space to be wound is too large or too small, in consequence of which the value of the armature is reduced. To

lthis ring my guards are applied to divide it into mathematically-equal bobbin-spaces. l Referring to the drawings, Fig. l shows a blank having the parallel slits Al A cut toward the center from each end. These slits 8o divide the blank into two tongues A? A2 and the lobes A3 A3. The latter are preferably rounded to conform to the exterior of the end of the coil. Bending said tongues away from and said lobes toward the eye, we have formed 8 5 the complete guard A, as shown in Fig. 2, the lobes A3 A3 standing lengthwise in vertical, and the tongues A2 A2 lengthwise in horizontal, planes. rlhe slits A A are separated from each other a distance equal to the width 9o of the finished coil B, Fig. 3, so that when the lobes A3 A3 are turned u pth ere will be a space between them equal to the desired width of the coil. This uncut portion forms a web A4, whose width between the tongues A2 A2 is 95 equal to the radial thickness of the core C, so that when said tongues are turned up the space between, them will be equal to the radial thickness of the core. Said core is shown in the drawings as being composed of a series of sheet-metal plates C2, applied to each other in planes at right angles to the axis of the armature. The core may, however,be formed otherwise.

In applying the guard to the core it is presented to the end of the core at t-he bobbinspace, and one tongue is pushed over the inner and the other over the outer face of the core between the radial extensions C until the portion A4 rests against the core C. Another guard applied similarly to the opposite end of the same bobbin-space prepares that portion of the core to receive the coil. The wire is now wound around the complete bobbin-space between the lobes A3, one strand being placed closelybeside the other until a sin* glelayer of wire quite fills the space between said lobes and the radial extensions C. Another layer is now formed upon the first, the strands of wire in the second layer being held upon those of the first at the ends of the core by the lobes A3 of the guard A. More layers are added until the space between the radial extensions C is even full, and each layerv is kept in place at the ends of the core by the lobes A3.

It will be understood that in order to secure the highest efficiency the space between the radial extensions should be quite filled by thecoil, in order that the average distance of the aggregate of the wires from the yiron of the outer portion of the polar extension shall be reduced to the minimum; but it is also understood that none of the strands of the. coil are to b e permitted to rise above said to move out of place. I havel also found that if the strands on thev outer portion of the coil are arranged in regular layers around the ends of the bobbinspace, and any of such strands are then allowed to move laterally fromthe layers beneath them, the strands so moving laterally are slackened to such an extent as to alloysT them to rise between the radial extensions C; or should any ofy the inner strands move laterally then the outerstrands will,\by suchmoving of the inner strands, lose their support and tension and be free to undergo this displacement.

When my guard is used, the entire coil may be wound in full and even layers and the strands held against lateral movement by the lobes A3 A3; hence there is no loss of tension in any of the strands, and the entire coil assumes and retains a correct form.

NVhen the Gramme ring is used, the guards are applied one against the other around the entirel ring, as shown in Fig. 6. The guards are cut of the same size and of such size as that the desired number will just fill the ring. Thus the ring is spaced evenly into equal bobbin-spaces, and when each guard is wound full the coils are all properly spaced and contain equal quantities of wire.

The guards may be insulated from the core C by interposing insulation material E between said core and the guards.

When applied to the Pacinotti ring, the lower tongue A2 may be omitted, so that the guard will consist only of the lobes A3 A3, web A4, and the single upper tongue A3. (See Fig. 8.) The latter should in this case be wide enough to t closely between the radial extensions C, whereby it is engaged and held in place.

Iclai 1n as my inventionl. In an armature, the combinatiomwith the core, of coil-guards applied to the ends of the core, said guards having lobes A3 and a web A4, connecting said lobes, and a tongue or tongues for securing' the guard tosaid core, substantially as described.

2. In an armature, the combination, with the core, of coil-guards applied to the ends of the core, said guards having lobes` A3 A3 and a web A4, connecting said lobes, and two tongues, one extending over the exterior of said core and the other over the interior of said core to secure said guard to said core, substantially as shown and described.

8. In an armature, the combination, with the core, of coil-guards applied to the ends of the core, said guards having a web A4 and lobes A3, extending outward from opposite TOO sides of said web, and tongues A3A3, extending the space betweenthe radial extensions, and

tongues A3, extending into the spaces between said extensions, and a web A4, connecting said lobes and tongues, substantially as described.

5. In an armature having a core composed of a series of sheet-metal plates C2, applied to each other in planes at right angles to the axis of the armature, the combination, with such core, of coil-guards applied tov the ends of the core, said guards having lobes A3 A3 and a web A4, connecting said lobes, and a tongue or tongues extending from said web over said core, substantially as described.

G. In an armature, the combination, with the core composed of the metal plates C3, of

the core composed of the metal plates C2, of In testimony whereof Iax my signature in coil-guards applied to the ends of the core, said presence of two Witnesses.

guards having lobes A3 A3, tongues A2 A2, and

a web A4, connecting said lobes and tongues, A and an insulation material E,'interposed be- Witnesses: tween the core and said guards, substantially L. VERNON FERRIS, as described. CYRUs KEHR.

VARREN S. BELDING. 

